Warp stop-motion for looms.



No. 643,402. Patentd Feb. l3, I900.

n. 0mm".

WARP STOP MOTION FOR LDUMS.

(Application filed Nov. 27, 1899.)

(No Model.)

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hAriENT RANDOLPII CROMPTON, OF \VOROESTER, MASSACHUSETTS, ASSIGNOR TO THE GROMPTON d: KNOWLES LOOM WORKS, OF SAME PLACE.

WARP STOP-MOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 643,402, dated February 13, 1900.

Application filed November 27, 1899. Serial No. 738,292. (No model.)

To all whom it may concern:

Be it known that I, RANDOLPH OnoMProN, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in WVarp Stop- Motions for Looms, of which the following is a specification.

My invention relates to warp stop-motions for looms of the class shownand described in United States Letters Patent No. 627,963, dated July 4, 1899, in which the drop devices or detectors are so located as not to rise and fall with the harnesses and are independent of the shedding mechanism.

I find in practice that in warp stop-motions of the class above referred to when the flat drop device, which is made of very thin metal,

that it is held by the transverse guiding-bar at its upper end, and consequently permit the vibrating feeler-plate to move too far and prevent the proper operation of the parts to stop the loom.

The object of my invention is to overcome this objection to the drop devices shown in said patent and to provide drop devices made of thin sheet metal which will be firmly held or wedged in the direction of their width when in their lower position and prevented from turning or twisting. In order to obtain this result, I make each drop device with a recess or notch in one edge at its lower end, and I make the surface which engages with said recess or notch of substantially the same shape and size as the recess, but preferably of a more obtuse angle than that of the recess,

- so that the engaging surface will wedge into the recess and act to firmly hold the lower end of the drop device in the direction of its width without any downward pressure thereon.

In practice I may make the vibrating feelerplate with an angular or wedge-shaped edge to engage the recess or notch in the edge of the drop device, or I make an angular projection on the transverse bar, against which the drop device bears, to engage the recess in the edge of the drop device, as will be here inafter fully described.

Referring to the drawings, Figure l is a sectional view of a warp-stop-rnotion drop-device mechanism embodying my improvements, showing the drop devices in their normal elevated positions. Fig. 2 corresponds to Fig. 1, but shows one of the drop devices in its lower position and engaged by the vibrating feeler plate or blade; and Fig. 3 shows a modified construction of the lower end of a drop device and the bar against which it bears.

In the accompanying drawings, 1 is the whip-roll over which the warp-threads 2 pass.

3 and 4 are parallel transverse bars secured at their ends to a stand or casting 5 at each side of the loom and extending under the warp-threads, which rest and are supported upon said bars.

6 and 7 are parallel transverse bars extending under the bars 3 and 4 and against which the drop devices bear when engaged by the vibrating feeler plate or blade. Between the bars 3 and 4 and 6 and 7 are arranged in this instance two sets of drop devices 8, which extend in a vertical plane. Transverse guidebars 9, secured at their ends to the stand 5, extend through elongated slots 8 in the upper part of each drop device 8 and act to guide and hold the drop devices in their proper vertical position. Each drop device 8 has a hole or warp-eye 8" therethrough below the elongated slot 8, through which opening a warpthread passes to support the drop device in its normal position. It will be understood that there is a drop device 8 for each warpthread. The lower end of each drop device 8 has in one edge at its lower end a notch or recess 8, preferably of angular shape, as shown. Lease-rods 10 and 11 extend trans- IOO tends transversely across the loom and is secured at each end on an arm 13, fast on a rock shaft 14, supported in hangers 15 or otherwise. The engaging edges of the plate 12 preferably conform, substantially, in shape and size to the shape and size of the notches or recesses 8 in the drop'devices 8; but'the angle of the engaging edge is a little more obtuse than the angle of the recesses 8', as shown, so that it will contact only near the outer edge of the recess, and thus hold or wedge the drop device more firmly to resist any tendency to turn or twist.

Rocking motion is communicated to the shaft 14 and to the vibrating feeler plate or blade 12 to cause the same to move in a substantially horizontal plane below the drop devices 8 when they are in their normal position, as shown in Fig. 1, by mechanism (not shown) in the ordinary way, and connections are made to the shipper device to stop the loom in case the movement of the vibrating feeler plate or blade 12 is prevented by engagement with one of the drop devices in case the drop device falls by the breaking of the warp-thread passing through the same, as shownin Fig. 2.

The plane of movement of the feeler plate or blade 12 is such and the shape of the notch or recess 8 in the lower end of the drop device 8 is such and the shape of the engaging edge of the blade 12 is such that when adrop device 8 drops and is engaged by the feeler plate or blade 12, as shown in Fig. 2, the drop device is crowded against one of the lower transverse bars 6 or 7 in the direction of its width and firmly held or wedged, so that it cannot turn or twist.

The position of the transverse guide-bars 9 relative to the elongated slot 8 in the drop with the upper-end of the slot 8, so that there is no strain on the drop device in the direction of its length, but only in the direction of its width.

I have shown in Fig. 3 a modified form of the drop devices shown in Figs. 1 and 2. The drop device 8 (shown in Fig. 8) has a straight edge where it is engaged by the vibrating feeler-plate 12, which may be of the ordinary shape and construction, and its opposite edge next to the bar 7 has a recess therein, preferably angular, to receive a projection 7 on the inner side of the bar 7, as shown, when the drop device 8 is in its lowered position and engaged by the plate 12. The projection 7 on the bar 7 is preferably angular, with a more obtuse angle than the angle of the recess in the drop device 8, as shown, so that the engagement of the vibrating plate 12 with the drop device will crowd the recess in the drop device 8 onto the projection 7 on the bar 7 and causethe drop device to be firmly held or wedged and prevented from turning or twisting.

It will be understood thatthe details of construction of my improvements may be varied somewhat, if desired. Instead of two sets of drop devices only one may be used. Y

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a Warp stop-motion, a series of drop devices supported in normal position by the warp-threads, and each device having a recess or notch in one edge at its lower end, to receive a projection of substantially the same shape and size as said recess, when the drop device is in its lowered position, to bind and hold the drop device in the direction of its width, and prevent its turning'or twisting, substantially as shown and described.

2. In a warp stop-motion, the combination with a series of drop devices supported in normalposition by the warp-threads, and each device having'a recess or notch in one edge at its lower end, of a vibrating feeler-plate having its engaging edge of substantially the same shape and size as the recess, to enter said recess when the drop device isin its low= ered position, and crowd it against atransverse bar, and prevent it from turning or twist ing, substantially asshown and described.

3. Ina warp stop-motion, the combination with a series of drop devices supported in normal position by the warp-threads, and each device having an angular recess or notch in one edge at its lower end, of a vibrating feelerplate having its engaging edge of angular shape, the angle being more obtuse than the angle of the recess in the drop device, to enter said recess when the drop device is in its lowered position, and force said device against a transverse bar, and hold it without turning or twisting it, substantially as shown and described.

4. In a warp stop-motion for looms, a series of drop devices independent of the shedding mechanism, each device provided with an elongated slot and a warp-eye at one end, and a recess in one edge at the other end, in combination with a fiat transverse guiding-bar passing through the elongated slot, and a vibratingfeeler-plate having an edge of angular shape to extend into the angular recess in the drop device when it is in its lowered position, substantially as shown and described.

RANDOLPH OROMPTON.

Witnesses:

J. O. DEWEY, M. J. GALVIN. 

